论文标题
在单线扩展模型中的暗物质液体密度稀释
Dilution of dark matter relic density in singlet extension models
论文作者
论文摘要
我们研究了由单元扩展模型中的电动一阶相变（FOPT）引起的暗物质（DM）液体密度的稀释，包括两-higgs-doublet模型（2HDM+s）的标准模型（XSM）的单元扩展（XSM）和近代最小的超中性标准模型（NMSSMSSMSSMSSMSSMSSMSSMSSMSSSMSSMSSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSMSSSMSSMSSSMSSMSSMSSSMSSSMSSSSMSSSMSSSMSSMSMSSSMSSSMSSSMSSSSMSSSMSSSSSSSSSSSSSSSSSSSSSSS。我们发现，在这些模型中，强的Electroweak FOPT释放的熵最多可以将DM密度稀释至1/3。然而，在XSM和NMSSM中，SINGLET场配置与相转换温度相关，强大的FOPT始终发生在DM冻结之前，这使得当前DM密度可忽略不计。另一方面，在DM冻结温度与FOPT无关的2HDM+S中，稀释可能会挽救某些由过度DM Relic密度或DM直接检测所排除的参数空间。
We study the dilution of dark matter (DM) relic density caused by the electroweak first-order phase transition (FOPT) in the singlet extension models, including the singlet extension of the standard model (xSM), of the two-Higgs-doublet model (2HDM+S) and the next-to-minimal supersymmetric standard model (NMSSM). We find that in these models the entropy released by the strong electroweak FOPT can dilute the DM density to 1/3 at most. Nevertheless, in the xSM and NMSSM where the singlet field configure is relevant to the phase transition temperature, the strong FOPT always happens before the DM freeze-out, making the dilution effect negligible for the current DM density. On the other hand, in the 2HDM+S where the DM freeze-out temperature is independent of FOPT, the dilution may salvage some parameter space excluded by excessive DM relic density or by DM direct detections.
